Vacuum-jar.



F. W. BARTLETT.

VACUUM JAR.

APPLICATION man 050.24. 1915.

Patented Nov.

attain;

Q To all who'm 'z' t cow-Era:

UNrrED OFFICE.

rnnnnmoxwrm'rnnrr, or CALDWELL, NEW J'ERSEY.

Be it known thatI, FREDERICK W. Bani LETT, a citizen of the United States, resid-- ing at 4:3 Overlook road, Caldwell, in the county of Essex and-State of New Jersey,

have invented certain new and useful 1mprovements in Vacuum Jars, of which the' following is a specificatlon.

This invention relates 'to glass double walled vacuum receptacles, and oneof its objects. isto provide avacuum receptacle in which supplemental inserted spacing devices or members between the inner'and outer walls of sald receptacle are entirely dlspensed with, thereby not only eliminating anitemof added expense'in the manufa'c ture oflthereceptacles, but also greatly increasing the temperature-retaining efliciency of the container by providing a normally uninterrupted space between the outer and inner walls of the receptacle.

A further object is to provide a vacuumreceptacle having a pourmg lip or bead around its-mouth, particularly in a recepr tacle whose internal diameter 'is substan tially the same. at its mouth as in its body.- Instead of providing spacing devices or members between the inner and outer walls of the receptacle, I provide indentations in one of the Walls ofthe receptacle which form protuberances extending toward, but. 1 not normally touching, the 'other wall of,

the receptacle. In practice," the ends of these protuberances will be separated from the other wall of the receptacle by a very small distance,- say," one-half, millimeter,- consequently, these protuberances serve as spacers and reinforcing devices, taking the place of inserted spacers, but they do not.-

normally touch the opposite wall and there is no contact of glass upon glass, and hence no danger, of breakage or; fracture. However, the distancc, usually one-half milli- -meter, normally existing betwee'n'the pro tuberances and the opposite wall of there .ceptacle is suflicient to compensate for. any

expansion of thex'glass. Furthermore, the

, distance is so slight that th\pr0tuberances f constitute effective reinforcing and bracing means" serving the purpose usually performed by spacers or fillers, for the reason that before the glass at the neck of the con-' tainer, which necessarily bears the strain of holdingthe inner wall, hasreached its limit of expansion, one at least of the protuberances willtemporarily come in contact with vAcuuM An,

- -j specification'ofletters Patent.

'- Application area December 24, 1915.- s ems. @3500,

- the other wall and thus prevent :further I movement. The indentations and protu'ber= ances are preferably located at the lower portion of the receptacle, but they. may be disposed at other points or at the lower portion of the receptacle and "also at points, h gher up. Ordinarily 'theyare arranged at t the lower port on only because the improved pouring; lip which I prov'de at'the mouth of the receptacle forms a connection" and 'bracebetween the inner and outer Walls of. I

"the receptacle at that point.-

The pouring lip constitutes a part of the present invention tinuous at the-mouth hollow throughout This lip prevents any fracture of the receptacle at this pomt, gives additional strength to the receptacle and en- 'ables'all drops of on a cup or spoon when pour-in the liquid to My mvention is particularly adapted for embodiment in ternal diameter throughout, as distinguished from bottles,having a contractedjneck.

wish it' understood, however, that the invenQ tion is not limited to embodiment in awide. mouthed receptacle,but canbe' provided on a-vacuum bottle, carafe, jug, pitcher, fire; less cooker, or other glass vacuum receptacle .or' container.

a a In the accompan yin g'drawingsFigure 1,

is a side elevation of areceptacleembodying my invention and having in this instance the form of a jar. Fig. 2 is a vertical section of the same, and ig. 3 is a'horizontal section on line 3-.3, Flg. 1.

- The inner and outer walls 1' and 2 con stituting the-vacuum jar are substantially cylindrical, except at their bottoms where they are rounded. The sealed-projection which is provided after exhaustion is'sh'own The inner and outer walls are joined by'a complete or annular hollow pouring lip, .or rounded bead 4 which gives strength to the'jar and enables pouringtobe acCom- V 'plished with facilityand all the drops of liquid to be drained 0 Pa ented 14, i

and is circular. and con! 1 of the receptacle and be caught a receptacle capable of use either as a liquid or a food container, and 1n one which is of substantially the sameiI,1-'

with the rojections may 25 of the jar or arated from said wall by a very slight space,

as at 7. This space is, in practice, about one-half millimeter in extent which is sufficient to prevent contact of the inner wall rotuberances under normal conditions. his is'a matter of very great importance in the practical operation of these devices, because any spacing element which extends entirely across the interwall space 1 forms a conductor of temperature which assists materially in lowering the efiiciency of the receptacle as a heat insulator. Under the greatest usual expansion of theinner wall, the protuberances will barely touch the wall opposite to them. 7 Moreover, they constitute a spacing and bracing means which will prevent any dangerousvibration of the inner wall, but as there is no usual contact of glass on glass, danger of fracture is eliminated. The indentations and projections are usually provided at the lower portion of the jar-and in about the same transverse plane, but other indentations and be provided at other points both at the lower portion 0f the jar and at points higher up thereon, within the 'purviewof the invention. Any suitable stopper or closure may be provided such, for instance, as the cork 8. The walls of the receptacle are provided with the usual silver or mercury coating, not shown.

My jar is as well adapted for holding food or solid material as it is for containing liquids.

In referring to theinvention as a jar in n the foregoing description and in the claims,

I also intend to cover its use on bottles,

' carafes and in short any glass doubled walled receptacle.

slightly spaced from and out of contact with, the opposite wall.

2. A vacuum jar comprising inner and outer walls joined together at their mouths by an annular hollow pouring lip or bead, the outer wall being otherwise free from the inner wall and provided with inwardly extending indentations providing free internal projections or protuberances whose tips extend toward, but are normally slightly spaced from and vout of contact, with, the

inner wall. I

3. A vacuum jar comprising inner and outer walls of substantially the same diameter throughout and joined. only at their outer ends by a hollow annular pouring lip or bead, said outer wall being otherwise free from the inner wall provided with inwardly extending indentations providing free internal projections or protuberances whose tips extend toward, but are normally slightly spaced from, and out of contact with, theinner wall.

In testimony whereof Iaflix my signa- I ture in presence of two witnesses.

FREDERICK-W. BARTLETT.

Witnesses:

W. LOCKE R GKWELL, RAoUL H. DE RAIsMEs. 

